Like most kids Karis' age, she throws food on the floor when eating in her high chair. When Karis does this, we reprimand her and tell her to put the food she doesn't want in the cup holder and not on the floor. For the most part, she's been pretty good about doing what we ask.
But then, she started putting food behind her head... most often when we're not looking. She finishes her meal and we think, "Wow, she ate great today." And then we take her out of her chair and half her meal is falling down behind her back.
So, whether putting food on the floor or behind her head, we firmly tell Karis "no." But her most recent "misbehavior" is not as easy. It's quite humorous and it's hard not to just laugh. Now she tries to see if she can get her food to stick to her head. It's the funniest thing. She knows that bananas and mandarin oranges stick best in her hair and pears and strawberries will stick to her forehead, if pressed up against it just the right way.
I try not to laugh or encourage her to do this. Here is my response (and hers) to sticking food on her head.